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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b32252f71618ef3c4db5134e099f90cda95f47deea4ea4f67f494f1fcfa38885' 
  AND token = 'uWUxIQdJBMEb2Pf17uCz69xRxrY//0/Aix0YK+3eb14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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