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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba05ea524afdc91b7ad78e5e5bf6e80e385425c9cc0d54c9a02937037a382aa0' 
  AND token = '+NMJeCD9d0bGsqYR/ztsQ+6YMujsZCFuR9RAbK8NQSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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