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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db205b65596a41ba8cc75157f3e816ff2f4a0db74a279e8849e339e68860a21e' 
  AND token = 'qAlciPkOvKNqTzCs5ygczHKKyVvXi89Yi5aJazgT9Qg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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