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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3caa6bcfa37f694146ae37a13ce34f510da130b7830674b3090969f6ad2c036c' 
  AND token = '5bAqn6KIywo5B855haxuqsgrGO+Y3XfjEfg/Gy02PrM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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