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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf61f2e4c7662186e7756ae37538c61d23ece5b1c25fa3535f7cce11b3e71ad9' 
  AND token = 'vCTPnDkLYAHiamxrNGVnGUFQ3r6f7JileF34HEvbZYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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