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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c7c04c00750c1186ec50c9ec2061323009b6668ad23eadc2685652775ed2e1d' 
  AND token = '1Lxc/uY30GpKCmpkWwOZdESg+OC2oD6hBfl2N4w/qZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}