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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cda21fa0487437a051617112965ef8a1d55f662b3ed190d13b9e3c49e30e672e' 
  AND token = 'wu4eMtzG1akjpruRwjvrxrhnC1HRxtXaG+syvJ9PIBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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