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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9886bc1f60a117fc8894f1f4e310b9a11ed015921ba9c39c9a2dcab6f4a5f8b7' 
  AND token = '5ZLsUhe/g3Z8e+qMIQ1tfac8BGGshuDrn6YQFaM9W7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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