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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09a93d13ebd3af6575a1d7a94f5c2af0e854bd7b38db214d69a597f4f533f32b' 
  AND token = '3u+3T25HXASnYBPRMoLtd5ML9llNYFwEPztUPYVmL3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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