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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ac735001e2d14cc4274cb6b339d413702b8171a020158048399dd39be111355' 
  AND token = 'z/zO2ww9S5RKCH9PXribAlxbOBS0DMv35iZ1hDanVvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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