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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38e3be7c43067f8184f06f1e9b75b3e5ffe81d425a81bf9f0fc5741e2e615ecd' 
  AND token = '+B6XrjDZdclxTAkVHuH5XQ8uELFBNY6LwfhrcCFoh0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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