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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0133156a08a8a851c21bd4aaf7b0ad9174b336ee1d26b9ee44a8bbc87c77ba7' 
  AND token = '3PVxC+5jQL0+gBM+OgGcgjRM+o+vP1P10moXdG9KC5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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