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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17602faeebc4f6f1fec523f4f37e05577bb2d1f04f3aa9c5da59750cd475ba30' 
  AND token = 'TYIcb8dPKbCmHYD/cBnQbn2MTExlnVdEJ+JK1LIo1DQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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