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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fcc3a586e8b61db4ba122b794c17f1802b91b69a347665740c8d0e7ed211860' 
  AND token = 'BDw0l/euK4no+5DJQU//ySBGFmbc/hKczRTn+bIlq3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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