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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fedd5e7360c14677f7499fa7b7c9d6384075a579da3466870cef5f64c54933f5' 
  AND token = 'OpVquSYXukJk3+FbtpLSofNGPXgOQXILBrDyCqSo59k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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