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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86dcacdeb56162eba95a30b6520cb8cb4f40c4a20130c2e6a458717448d8ccff' 
  AND token = 'g8ET7VzworlPoo/Sa1VHkwryW2LpHQ8VONxtejQfrgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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