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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07b2c046d8fe2c7fedda18c4db50e0e491967e8cfd29a45b188597d0a6884670' 
  AND token = 'EWEtSWRurZLyoqcICMyWJps2q9aviTTeP+6tCgPGG0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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