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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98a4d2f50540f38d6f00e6c856567a3e295fdec64d73d22084d0211589cc9fe5' 
  AND token = 'EDjmGA9Ew3c7ubFysBLIcgp9aNiJlMP07a12rRBf/m0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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