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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2abfcec00fc1362988911a0d4ba7d59d18b176f5ed9cdeea91e497b41b897278' 
  AND token = 'mHeVgAiUNlw0A19ZG8pJACdwbtM9uHpPca+YXnC1CC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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