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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d9ba404d4e38d11223f9e6949e9ca4eb13041d4022528d818a5e5792b19c432' 
  AND token = 'mcob0UXIqaXY7QNCWkXGIxXCx+Um2lU4Juc8QPshYks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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