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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2534a671014613531474b6c3df46205929bbe514b1e6ad3bddb3495e34ed1ad8' 
  AND token = 'CK1CO3qizxpRw4xkR4kMhDzCnyXJie51/Y0fgm5hnoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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