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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f60bf2cc9da3c2cccab36f7bd7bf8aec3243e9a35c669e99988d1e9c908e1c5c' 
  AND token = 'hZYOBdhRLbQkgc50DbiI7FNAZh/NJ2rKiMwpA04kQv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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