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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04deabd6f02e8eb4505883f03190b058272584f52fe8e43f777da225f2f7aeb0' 
  AND token = 'Wo0FScQSESRNJWElIIdMUlEP8QSYx3lXA+y79eXUfno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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