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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87c9af5db16a0c777bddc2d1562d6ee0a64d9a22c4b4a6ad5d44a3b0718971c6' 
  AND token = 't94wJqK5IQFBAaZ9b0MS7+Gc/Jwe5XsUMJqcTy6leFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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