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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ea081198de4e617dde62b15bc93a9456fe2fb3c4bf7030626da277ffb51e6f6' 
  AND token = '9vyO4Bqnypj3rWIIVL+76UsCbp5SZwVWky7Inl7tQSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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