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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b7e73f6b006b969541e914cdcfaf0cf9390b61d0150a1b4c137811ccf39c544' 
  AND token = 'cyNL+xsmrazgxUQxSg8ywXu5wLsxTnTm4tVj9JI8NCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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