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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51a059eab5f8e79aaa696b45a5394164eeefd6d7e0e6946c3c96f3d6cfed81c6' 
  AND token = 's0mVYC0S+PBoq8vKrPKL4mnzSfZaNzlny87oU0nO4k4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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