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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16bd471fe2f308a8a3b2a49eb0e41f67c599e86d29a2da7cfc8bb4c0fd5d8879' 
  AND token = 'lGYUvSvBmr5lcDCmJ1im2WZfwoEki8XRFYeriNqKuR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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