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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '527d2de00e6eb0977c7ef2ce1c61b019a7931aab2aca1a53385ce0aaab3dac22' 
  AND token = '+k6psac0S8rvlD71dft2zIatb1eeGpQ7LSnwqOcqJYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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