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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9483407efd2e6a4dc4ca1d046a68cffaab500222c73b034f11199cec025772e' 
  AND token = '4zLMq7lomNwSdHP7SwcLNj2mMIArCsyn1ozraP+ZdjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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