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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e76474faeaf91765538b00e478a436c044f2b4f55cef7c01186c70fb721433be' 
  AND token = '52r81oec99qVeF0uyNvfzEw6Gs3Spy7Y+d0UBIIvy4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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