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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a644b4a36fa8cf17b890550a4437cd415abd40fa7f738112ca7756da9220903c' 
  AND token = 'unrOuyRpEzyZrlANEFk86XkwUTtJuLdSTgxmEGk77Sg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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