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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f31863f528fd2ab5e2d6a6378630df0de5153a7808963eb8fbf415645e1262d8' 
  AND token = 'M3Q4kykS8TAKRoqE6s2ZCdKvaKnXi7Pt1xfqmHtBsDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00091

JSON explain

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